Hi my name is eddie. I can help you with your difficulties and I might need some information and I will ask you questions that I will need specific answers for. With your help, finding out what is right with it, is a step to eliminate what is wrong with it ......sometimes it may be one of a hundred things but together with your patience we can work toward a goal to get this issue resolved. I will do my best to provide you with a satisfactory and a reasonable answer.
As I see it now ........that soundboard might have been made of all recycled materials..........I would call where you purchased it from to find out ..........plus it is a little hard to pin it on that because everything should be encapsulated with the rock and mud...................so it just might leave the paint .............I am sure you have some left over so compound and paint a piece of drywall ..........by using the same conditions and then see if indeed it is emitting an odor ...............if you have to do a rip out use steel Resilent Track for soundproofing........you'll be better off
We can start here and with the info you provide I will add steps toward our target as we proceed by our correspondence
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And thank you for your help and assistance